I suggest you ...

Mini-camera to monitor weapons' trajectories

A mini-camera at the top right or left (150*150 px or smaller) to check the weapon trajectories. So, in this way, you can hide your worm after shot while you monitor your granade!
To me, this is necessary in an elite or hysteria scheme where there is few time to hide worm.

it's important to point that this feature is different from the mini-map suggestion: this won't show the whole map, but a little window with no zoom, that follows the projectile. Behaviour with sdet has to be defined.